Preheat oven to 350°F. Lightly grease a 9x5-inch loaf pan. I like to use parchment paper as well to make the cake easier to remove.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and 1 cup of the sugar together on medium-high speed (Kitchenaid #6-8) until they are smooth and fluffy, about 2 minutes.
1 cup unsalted butter, 1⅛ cups granulated sugar
Add the eggs, one at a time, allowing them to fully incorporate before adding the next one. The mixture may look curdled at this point-- just continue mixing.
4 large eggs
Add the vanilla extract and mix to combine.
1 teaspoon pure vanilla extract
With the mixer on low, gradually add in the flour. Once you’ve added all the flour, stop mixing-- you don’t want to overmix!
2 cups all-purpose flour
Gently fold the blueberries and lemon zest into the batter. Continue folding until no large lumps of flour remain.
1 cup blueberries, 2 teaspoons lemon zest
Transfer the batter to the greased loaf pan and top it with the remaining 2 tablespoons of sugar.
Bake the pound cake on the middle rack for 55-60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 5 minutes. Then, run a knife around the edge and turn it out onto a wire rack to cool completely.